30results about How to "Solve the low leaching rate" patented technology

The invention discloses a method for removing lead in heavy metal polluted soil by utilizing nanometer zero-valent iron and citric acid for combined elution. The method comprises: adding nanometer zero-valent iron into a citric acid solution to prepare a nanometer zero-valent iron and critic acid composite solution, adding the composite solution into lead polluted soil, performing oscillation, elution and centrifuging at room temperature, then performing membrane filtration and collecting filtrate. The eluent is simple to prepare, strong in operationality and substantial in elution effect, and has the elution rate on lead of 83.08%; the lead content of eluted soil accords with soil environmental quality standards; lead in eluate can be recovered by chemical precipitation, biological adsorption and the like, and the eluate reaches discharging standards and does not cause secondary pollution to environment.

The invention relates to a lead and zinc tailing recovery technique, in particular to a lead and zinc tailing recycling method, which solves the problems that the leaching efficiency is low and the recovery cost is high when the existing lead and zinc tailing recovery technique is adopted. The lead and zinc tailing recycling method is realized through the following steps of: 1) mixing concentrated sulfuric acid with saturated sodium chloride solution to obtain leaching solution; 2) placing lead and zinc tailing slag in an agitating tank, adding the leaching solution into the agitating tank and fully agitating at 5-20DEG C to leach lead ions, zinc ions and silver ions contained in the lead and zinc tailing slag; 3) adding sodium sulfide solution into the agitating tank and fully agitating at 5-20DEG C; and 4) adding ammonium hydrogen carbonate solution into filtrate containing the zinc ions and fully agitating at 5-30DEG C. The lead and zinc tailing recycling method effectively solves the problems that the leaching efficiency is low and the recovery cost is high when the existing lead and zinc tailing recovery technology is adopted, and is suitable for recovery of lead and zinc tailing.

A method of recovering a precious metal from a sulphide mineral slurry which contains the precious metal which includes the steps of subjecting the slurry to a bioleaching process, supplying a feed gas which contains in excess of 21% oxygen by volume to the slurry, and recovering precious metal from a bioleach residue of the bioleaching process.

The invention discloses a method for recovering indium from an indium-containing material. The method comprises the following steps: (a) leaching: leaching the indium-containing material with hydrochloric acid under a heating condition by adding an oxidizing agent, and after leaching, adding a flocculant to clarify the precipitate and obtain a supernatant; (b) reduction: adding iron powder to the supernatant to reduce Fe<3+> in the supernatant; (c) system optimizing: adding a sufficient amount of a sulfate ion-containing reagent into the reduced indium-containing solution, so that the reduced indium-containing solution is optimized from a hydrochloric acid system into a sulfuric acid system; (d) extraction: extracting the indium-containing solution subjected to the system optimizing with a P204-containing organic phase to obtain an indium-containing organic phase; and (e) indium production: conducting reverse extraction and displacement on the indium-containing organic phase to obtain sponge indium, and conducting melt casting on the sponge indium to obtain crude indium. Due to adoption of the method disclosed by the invention, not only the high leaching rate in the leaching process, but also the extraction rate and the product quality of indium can be ensured.

A method of extracting Te and bismuth oxide and recovering byproduct comprises: leaching raw materials with a Te content of ≧1.8% by utilizing a leaching system containing H₂SO₄, Cl⁻, Br⁻, NH₄⁺ and NaClO₃, reducing leach solution with SO₂ gas by precipitation method after separating impurities from it, washing with concentrated hydrochloric acid to obtain tellurium precipitation (18), purifying to obtain Te with a purity of higher than 99.99%. The filtrate produced is used for extracting Bi₂O₃ with a purity of higher than 99.99% when Bi content in the raw material is ≧2%. Acidic waste solution produced during the process could be returned to the leaching step for recycle.

The invention discloses a comprehensive recovery method of waste electrolyte containing lithium and aluminum. The method comprises the following steps: crushing and finely grinding the waste lithium-aluminum-containing electrolyte into electrolyte powder; preparing an acid solution, and adding a leaching enhancer; then adding the electrolyte powder into an acid solution for leaching, and filtering to obtain a filter residue A and a filtrate A; washing and drying the filter residue A to obtain a subcryolite product; adding alkali liquor into the filtrate A for adjustment to generate crystal precipitates, and filtering to obtain filter residues B and filtrate B; drying and calcining the filter residue B to obtain an aluminum fluoride product; adding sulfate into the filtrate B for reaction to generate precipitate, and filtering to obtain filtrate C; evaporating and concentrating the filtrate C to separate out solid substances, filtering to obtain sodium salt and a concentrated solution D, adding carbonate into the concentrated solution D to react, and filtering and drying after reaction to obtain a lithium carbonate product. The storage problem of the waste aluminum electrolyte can be effectively solved, harmlessness and recycling of the waste electrolyte are achieved, and environmental protection is facilitated. Therefore, the method has remarkable economic benefits and social benefits.

The invention relates to an ion exchange method for extracting gallium from seed separation mother liquid, which is characterized in that gallium is extracted from seed separation mother liquid for producing alumina by different ion exchange equipment and ion exchange methods, namely the ion exchange method comprising the following steps: connecting a plurality of fixed beds in parallel to adsorb the seed separation mother liquid; removing the mother liquid by a centrifugal machine and then washing impurities in rotating flow; connecting the fixed beds in series to leach the impurities; and removing leaching agent by the centrifugal machine. Compared with the prior moving bed, ISEP technology and complete counter-flow mixed bed ion exchange, the technical method has the advantages of low production cost, simple technical equipment, convenient operation, easy automation realization, and the like.

A process for recovery of one or more elements, selected from precious metals and chalcophile metals, as herein defined, from materials containing precious and/or chalcophile metal/s, said process including: (i) contacting the material with an alkaline solution containing a lixiviant comprising an amino acid, or derivative thereof, and an alkali stable transition metal complex in order to form a leachate containing the precious metal and/or chalcophile metal; and (ii) recovering the precious metal and/or chalcophile metal from the leachate.

The invention relates to the field of chemical methods for extracting vanadium, and in particular relates to a method capable of greatly improving the conversion rate and leaching rate of vanadium forroasting a vanadium-containing material by using a chain grate machine and a rotary kiln. The method comprises the following steps: a, crushing the vanadium-containing material to a required particlesize, mixing the crushed particles and additives, and performing mechanical activation to obtain a mixture; b, uniformly arranging the formed material in the chain grate machine by using a roll screening machine, and performing drying, curing and strengthening in the chain grate machine; and c, allowing the formed material to enter the rotary kiln for concentrated high-temperature roasting, performing discharge to obtain a vanadium-containing formed clinker, crushing the vanadium-containing formed clinker to a required particle size, and performing water leaching or acid leaching to obtain avanadium-containing leaching solution, wherein the vanadium-containing leaching solution is used for subsequent vanadium precipitation. The method uses the chain grate machine and the rotary kiln to roast the vanadium-containing material, has the technical advantages of a simple and easy process, low requirements for equipment, convenient operation, a wide application range and low costs, and is particularly suitable for the vanadium-containing material roasting process.

A cement curing formulation and curing method for high-level radioactive boron waste resins from a nuclear reactor. The curing formulation comprises the following raw materials: cement, lime, water, curing aids and additives. The curing method comprises: (1) weighing the raw materials and the high-level radioactive boron waste resins, and adding lime into a curing container; (2) then adding the high-level radioactive boron waste resins; (3) feeding other raw materials under stirring; (4) adding the cement and supplementing water depending on the moisture state of the cement, and stirring until uniform; and (5) standing and maintaining after stirring until uniform. The curing formulation has the features of a high curing containment rate, high strength of the cured body, better water resistance, better freeze-thaw resistance, and low radioactive leakage.

An object of the present invention is to provide a method for recovering gold in an ore or a refining intermediate by sufficiently leaching gold in a raw material resulting from the ore or the refining intermediate in an acidic solution containing a copper ion, an iron ion and a halide ion, which can contribute to improve the recovery rate of gold. Provided is a method for recovering gold from an ore or a refining intermediate containing gold, the method comprising a step of contacting a gold-containing raw material obtained from the ore or the refining intermediate with an acidic solution containing a copper ion, an iron ion and a halide ion while supplying an oxidizing agent to leach the gold component in the raw material, and the halide ion in the acidic solution comprising at least a bromide ion, wherein the concentration of the bromide ion in the acidic solution is 100 g/L or more or the concentration of the bromide ion in the acidic solution is less than 100 g/L, and wherein when the concentration of the bromide ion is less than 100 g/L, a concentration ratio of the halide ions in the acidic solution is such that a ratio of the concentration of the chloride ion to the concentration of the bromide ion (a Cl/Br concentration ratio) is ⅓ or less.

The invention relates to a functional ionic liquid and a preparation method thereof as well as a method for ultrasonic intensified leaching of Cd in soil and a recycling method. The functional ionic liquid is bi(2-ethylhexyl) sulfosuccinic acid tetrabutyl ammonium chloride. The preparation method comprises the following steps: dissolving bi(2-ethylhexyl) sulfo sodium succinate and tetrabutyl ammonium chloride in trichloromethane, stirring and performing refluxing reaction for 20-30h at 45-55 DEG C, so as to obtain a crude product; washing the crude product until no chloride ion is detected ina water phase; removing trichloromethane from the obtained product, and drying to obtain the functional ionic liquid. The method for leaching Cd in soil comprises the following steps: mixing soil, thefunctional ionic liquid and water, ultrasonically leaching heavy metal Cd in the soil; performing centrifugal separation after leaching is ended, so as to remove ionic liquid and water, and washing and drying the obtained soil. According to the invention, Cd in the soil can be effectively leached, the leaching time is short, and the functional ionic liquid can be recycled, thus being green and environment-friendly.